Hydraulic elevator



(Nmodelj J. S'. MGDONALD.

HYDRAULIC ELBVATORi No. 374,901. Patented Dec. is, 1887.

#i .ful/Uhm gw ATTORNEYS.

` UNITED STATES PATENT OEEICE.

JOHN SHEPHERD MCDON ALD, OF NEW ORLEANS, LOUISIANA.

HYDEAULIC ELEvAToR.

SPECIFICATION forming part of Letters Patent No. 374,901, dated December 13, 1887.

(No model.)

To aZZ whom it may concern:

Be it known that I, JOHN SHEPHERD Mc DONALD, of New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and Improved Hydraulic Elevator, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved hydraulic elevator in which water containing considerable sediment can be used as motive power.

The invention consists of a cylinder closed at the bottom, and in which operates a plunger extending through the open upper end of the cylinder, and of water inlet and outlet openings entering said cylinder at the bottom below said plunger.

The invention also consists of various parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Referenceis to be had to the accompanying drawings, forming a part of this specilication, in which similar letters of reference indicate corresponding parts in both rigores.

Figure lis a longitudinal sectional elevation of my improvement, and Fig. 2 is a sectional plan view of the sanieren the line a: :c in Fig. 1.

In the cy linder A, which is closed at the bottom and open at the top, operates the upwardly'extending plunger B, supporting on its extreme upper end, on the outside ofthe cylinder A, the carriage O. On the sides of the cylinder A are formed two channels, D and E, connected near their upper ends with the water inlet and outlet pipes F and G, respectively, the pipes being provided with the valves H and I, respectively, connected with each other by a single rod, J, so that the valves are operated simultaneously and in such a man ner that when one opens the other closes, and vice versa. The lower ends of the channels D and E open, by means ofthe apertures A', into the bottom ofthe cylinder A, said openings A being formed inthe wall of the cylinder. The plunger B, when in its lowest position, rests a short distance above the bottom of the cylinder A, so that the apertures or openings A are not closed, but always remain open.

The operation is as follows: The water containing sediment passes through the pipe F into the channel D, and down the same and through the aperture A into the lower end of the cylinder A, and exerts its pressure against the lower end of the plu-nger B, which is thus moved upward in the cylinder A, thereby raising its carriage and load. As soon as the plunger B reaches its extreme upper position, then the valve H is closed by moving the valve-lever, whereby the other valve, I, is opened, and the weight of the plunger B, its carriage C and load, causes the plunger B to move downward, whereby the water escapes from the cylinder A, through the opposite opening, A, into the channel E, and out of the same through the pipe G. The sediment contained in the water is prevented from settling in the bottom of the cylinder or in the channels D or E by ther rush of the water in passing through the apertures A', whereby the sediment contained in the water is carried along to the outside. Vhen the plunger B is in its lowest position, and the operator again desires to raise it, then he shifts the valvelever so that the valve I is again closed and the valve H is opened at the same time, and the abovedescribed operation is repeated.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent-- 1. In a hydraulic elevator, the combination, with a cylinder closed at its bottom and open at the top, of a plunger extending through the open top ot' the cylinder and channels connecting at their lower ends, by means of inlet and outlet openings or passages, with the bottom of the cylinder, while the upper ends of said channels connect with the inlet and outlet pipes, substantially as and for the purpose set forth.

2. In a hydraulic elevator, the combination, with a cylinder closed at its bottom and open at the top, of a plunger extending through the open top ol the cylinder, channels extending along the sides of the cylinder, opening into the bottom of the cylinder, and connecting with the inlet and outlet pipes at the top, and valves held in said inlet and outlet pipes, and adapted one to stand open while the other is closed, substantially as and for the purpose set forth.

JOHN SHEPHERD MCDONALD.

Witnesses:

EDEL COND, G. D. SPRIGG. 

